package com.itheima.filter;

import com.itheima.utils.CurrentHolder;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse  response = (HttpServletResponse) servletResponse;
        //1.获取请求路径
        String requestURI = request.getRequestURI();
        //2.判断当前请求是否是登录请求
        if(requestURI.contains("/login")){
            log.info("登录请求,放行");
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头中的token
        String token = request.getHeader("token");
        //4.判断token是否为空
        if(token == null || token.isEmpty()){
            log.info("令牌为空");
            response.setStatus(401);
            return;
        }

        //5.解析token
        try {
            Claims claims = JwtUtils.validateToken(token);
            Integer i = (Integer) claims.get("id");
            Integer empId = Integer.valueOf(claims.get("id").toString());
            CurrentHolder.setCurrentId(empId);
            log.info("当前登录员工id:{}",empId);
        } catch (Exception e) {
            log.info("令牌非法");
            response.setStatus(401);
            return;
        }
        //6.放行
        filterChain.doFilter(request, response);

        //7.删除ThreadLocal中的数据
        CurrentHolder.remove();
    }
}
